Driving System Design of Lifting Permanent Magnet

2013 ◽  
Vol 765-767 ◽  
pp. 125-128 ◽  
Author(s):  
Ning Ding ◽  
Ding Tong Zhang ◽  
Yu Mei Song ◽  
Jian Shi ◽  
Li Gong Ding
Keyword(s):  
Magnetic Field ◽  
System Design ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Superposition Principle ◽  
Drive System ◽  
Driving System ◽  
The Magnetic Field

Based on our proposed superposition principle of the magnetic field, the drive system of parallel moving type and rotation moving type lifting permanent magnet were designed. Industry prototypes were manufactured, respectively, and they verify that the designed lifting permanent magnets are feasible.

scholarly journals Design of a New 1D Halbach Magnet Array with Good Sinusoidal Magnetic Field by Analyzing the Curved Surface

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2522
Author(s):  
Guangdou Liu ◽  
Shiqin Hou ◽  
Xingping Xu ◽  
Wensheng Xiao
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Permanent Magnet ◽  
Flux Density ◽  
Permanent Magnets ◽  
Air Gap ◽  
Curved Surface ◽  
Magnetic Flux Density ◽  
Sinusoidal Magnetic Field ◽  
The Magnetic Field

In the linear and planar motors, the 1D Halbach magnet array is extensively used. The sinusoidal property of the magnetic field deteriorates by analyzing the magnetic field at a small air gap. Therefore, a new 1D Halbach magnet array is proposed, in which the permanent magnet with a curved surface is applied. Based on the superposition of principle and Fourier series, the magnetic flux density distribution is derived. The optimized curved surface is obtained and fitted by a polynomial. The sinusoidal magnetic field is verified by comparing it with the magnetic flux density of the finite element model. Through the analysis of different dimensions of the permanent magnet array, the optimization result has good applicability. The force ripple can be significantly reduced by the new magnet array. The effect on the mass and air gap is investigated compared with a conventional magnet array with rectangular permanent magnets. In conclusion, the new magnet array design has the scalability to be extended to various sizes of motor and is especially suitable for small air gap applications.

scholarly journals Alternative Approach for the Calculation of Magnetic Field due to Magnet for Magnetic Field Visualization and Evaluation

2020 ◽  
Vol 15 (1) ◽  
pp. 150-160
Author(s):  
Kishor Kaphle ◽  
Gyanendra Karki ◽  
Amrit Panthi
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Field Distribution ◽  
Permanent Magnets ◽  
Magnetic Field Distribution ◽  
Geometrical Shape ◽  
Shape Transformation ◽  
Basic Principles ◽  
Alternative Approach ◽  
The Magnetic Field

 The magnetic field of different geometry of the permanent magnet is analytically calculated by using basic principles of the magnetism in very easier approach. Concept of origin shifting and geometrical shape transformation are used to formulate the formula for cuboidal, cubical and cylindrical permanent magnets. This concept can be used for the analysis of magnetic field distribution in space around for permanent magnet as well as electromagnet in a very easier approach. Handy and simplified software is made to calculate the magnetic field due to permanent magnet and electromagnet at any desired position on space. Magnetic field visualization is also done in both magnitude and direction by using MATLAB.  

Research on the Magnetic Force of a Blood Pump Driven by Large Gap External Magnetic Field

2012 ◽  
Vol 271-272 ◽  
pp. 1636-1640
Author(s):  
Xiao Yan Tang ◽  
Zhong Yun ◽  
Chuang Xiang
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Force ◽  
Permanent Magnets ◽  
Magnetic Field Intensity ◽  
Current Theory ◽  
Calculation Model ◽  
Blood Pump ◽  
Single Turn ◽  
The Magnetic Field

The calculation model of the single turn rectangle current carrying coil was established. The theoretic formula for calculating the magnetic field intensity of any point in space was derived. For a pair of radial magnetizing permanent magnets, the formula for calculating the magnetic force of permanent magnet in the magnetic field was deduced based on the equivalent current theory of permanent magnet. According to the formula, the influencing factors and the changing rules for the magnetic force of permanent magnet can be seen directly: the current, the coil turns are proportional to its magnetic force, while the coupling distance is inversely proportional to its magnetic force.

scholarly journals Boundary-integral model of permanent magnet of a tube segment as shape

2011 ◽  
Vol 60 (4) ◽  
pp. 413-432
Author(s):  
Krystyn Pawluk ◽  
Renata Sulima
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Boundary Integral ◽  
General Idea ◽  
Integral Approach ◽  
Integral Model ◽  
Magnetic Flux Density ◽  
The Magnetic Field ◽  
Tube Segment

Boundary-integral model of permanent magnet of a tube segment as shape The magnetic field due to a permanent magnet of a tube-side segment as shape and of radial-oriented magnetization is considered. Such a sheet modelling a single pole of the magnet is used to express the suitable contribution to magnetic quantities. A boundary-integral approach is applied that is based on a virtual scalar quantity attributed to the magnet pole. Such an approach leads to express analytically the scalar magnetic potential and the magnetic flux density by means of the elliptic integrals. Numerical examples of the computed fields are given. The general idea of the presented approach is mainly directed towards designing the magnetic field within the air gap of electric machines with permanent magnets as an excitation source. Other technical structures with permanent magnets may be a subject of this approach as well.

scholarly journals A Novel Augmented Railgun Using Permanent Magnets

2019 ◽  
Vol 8 (1) ◽  
pp. 99-105
Author(s):  
M. B. Heydari ◽  
M. Asgari ◽  
L. Gharib ◽  
A. Keshtkar ◽  
N. Jafari ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Lorentz Force ◽  
Permanent Magnets ◽  
Pulse Current ◽  
Current Source ◽  
The Finite Element Method ◽  
Current Densities ◽  
Constant External Magnetic Field ◽  
The Magnetic Field

A novel augmented railgun using a permanent magnet is proposed in this paper. The effects of the permanent magnet on the magnetic field and distribution of current density have been investigated. High current densities in the railguns can lead to high local temperature and erosion of the rails. Therefore, the current densities in the rails and armature should be decreased without the reduction of the Lorentz force which is required for acceleration. For this purpose, augmentation of the magnetic field can be used as an effective method. The Finite Element Method (FEM) simulations have been applied in this article to analyze the performance of the railgun in the presence of the magnets. Two augmented railgun structures have been introduced to produce a constant external magnetic field. For both structures, augmented railgun characteristics are studied in comparison to the railgun without the augmentation. The results show that augmentation with permanent magnet increases railgun efficiency, especially in low current railguns. For pulse current source I=30kA, Lorentz force of the augmented railgun with four magnets is 2.02 times greater than the conventional railgun.

scholarly journals Analysis and optimisation of an axial flux permanent magnet coreless motor based on the field model using the superposition principle and genetic algorithm

2016 ◽  
Vol 65 (3) ◽  
pp. 601-611 ◽  
Author(s):  
Rafał M. Wojciechowski
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Field Model ◽  
Superposition Principle ◽  
Electromagnetic Torque ◽  
Axial Flux ◽  
Magnetic Field Simulation ◽  
Field Distributions ◽  
Field Simulation ◽  
The Magnetic Field

Abstract In the paper, methodologies for the magnetic field simulation in an axial flux permanent magnet coreless (AFPMC) motor have been proposed and discussed. Two approaches have been considered and investigated, both based on representing the 3D field distribution by superimposing axisymmetric 2D patterns. The first of studied approaches applies directly to the Biot-Savart law while the second uses a 2D axisymmetric finite element method. The selected results of magnetic field distributions and electromagnetic torque characteristics for the considered AFPMC motor have been presented and compared with results obtained using the commercial FEM package ‘Maxwell’. The elaborated algorithms have been incorporated into the design routines allowing multi-parameter optimisation of the considered motor construction.

scholarly journals Sample Size Effect of Magnetomechanical Response for Magnetic Elastomers by Using Permanent Magnets

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Tsubasa Oguro ◽  
Shuhei Sasaki ◽  
Yuri Tsujiei ◽  
Mika Kawai ◽  
Tetsu Mitsumata ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Size Effect ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Nonuniform Field ◽  
Compression Tests ◽  
Direction Parallel ◽  
Strain Behavior ◽  
The Magnetic Field ◽  
Magnetic Elastomers

The size effect of magnetomechanical response of chemically cross-linked disk shaped magnetic elastomers placed on a permanent magnet has been investigated by unidirectional compression tests. A cylindrical permanent magnet with a size of 35 mm in diameter and 15 mm in height was used to create the magnetic field. The magnetic field strength was approximately 420 mT at the center of the upper surface of the magnet. The diameter of the magnetoelastic polymer disks was varied from 14 mm to 35 mm, whereas the height was kept constant (5 mm) in the undeformed state. We have studied the influence of the disk diameter on the stress-strain behavior of the magnetoelastic in the presence and in the lack of magnetic field. It was found that the smallest magnetic elastomer with 14 mm diameter did not exhibit measurable magnetomechanical response due to magnetic field. On the opposite, the magnetic elastomers with diameters larger than 30 mm contracted in the direction parallel to the mechanical stress and largely elongated in the perpendicular direction. An explanation is put forward to interpret this size-dependent behavior by taking into account the nonuniform field distribution of magnetic field produced by the permanent magnet.

scholarly journals A Feasibility Study of a Noncontact Torque Sensor with Multiple Hall Sensors

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Kyungshik Lee ◽  
Chongdu Cho
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Power Transmission ◽  
Magnetic Sensors ◽  
Torque Sensor ◽  
Torque Measurement ◽  
Test Range ◽  
Variable Power ◽  
Hall Sensors ◽  
The Magnetic Field

The feasibility of a noncontact sensor is investigated. This type of sensor can potentially be used for torque measurement in a speed-variable power transmission system. Torque can be read by examining the phase difference between two induction signals from respective magnetic sensors that detect the magnetic field intensity of permanent magnets mounted on the surface of a shaft in rotation. A real-time measuring algorithm that includes filtering and calibration is adopted to measure the torque magnitude. It is shown that this new torque sensor can perform well under rotation speeds ranging from 300 rpm to 500 rpm. As an interim report rather than a complete development, this work demonstrates the feasibility of noncontact torque measurement by monitoring a magnetic field. The result shows an error of less than 2% within the full test range, which is a sufficient competitive performance for commercial sensors. The price is very low compared to competitors in the marketplace, and the device does not require special handling of the shaft of the surface.

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